Packet data communication device

Abstract

A packet data communication device has a lower-layer communication tool including at least a first lower-layer portion without an error-detection and retransmission function, and an upper-layer communication tool having both an IrTran-P function and an error-detection and retransmission function. When the first lower-layer portion is used, the upper-layer communication tool performs error-detection and retransmission of arbitrary-length packet data.

What is claimed is:  
     
       1. A packet data communication device, comprising: 
       a lower-layer communication means including at least a first lower-layer portion having no error-detection and retransmission function; and  
       an upper-layer communication means having an IrTran-P function and an error-detection and retransmission function, wherein  
       when the first lower-layer portion is used, the upper-layer communication means performs error-detection and retransmission of arbitrary-length packet data.  
     
     
       2. The packet data communication device according to  claim 1 , wherein 
       the lower-layer means includes the first lower-layer portion and a second lower-layer portion having an error-detection and retransmission function;  
       the upper-layer communication means has a function of selecting one of the first and the second lower-layer portions; and wherein  
       when the first lower-layer portion having no error-detection and retransmission function is used, the upper-layer communication means performs error-detection and retransmission of arbitrary-length packet data, and when the second lower-layer portion having an error-detection and retransmission function is used, the upper-layer communication means does not perform the error-detection and retransmission of the arbitrary-length packet data.  
     
     
       3. The packet data communication device according to  claim 1 , wherein 
       when the first lower-layer portion having no error-detection and retransmission function is used, the upper-layer communication means does not perform the error-detection and retransmission at a time of connection setting, and once the connection is established, the upper-layer communication means performs the error-detection and retransmission during communications subsequent to the connection establishment.  
     
     
       4. The packet data communication device according to  claim 1 , wherein 
       when an error has occurred at a time of connection setting, a connection setting procedure is restarted without performing the error-detection and retransmission.